From my experience , raspberry pi zero and raspberry pi 3 b+ can't handle default refresh rate 10. Because of this, I have to use command line every time with "-r 20". It would be nice if @Matlo could add a refresh rate option to the main gimx-launcher. It shouldn't be difficult. I hope this gets added in the next gimx update. Thank you. It's the only thing stopping me from using gimx-launcher.

I can't. I use a simple office mouse. Max refresh rate for this mouse is 125hz. But I don't think it's the refresh rate. On a Windows laptop, refresh rate 10 worked fine, but not on raspberry pi zero or raspberry pi 3 b+.